USPTO Patents Application 10004917

(54) VIBRATION ISOLATING DEVICE FOR HYDRAULICALLY OPERATED
CLUTCH

(ZTTSppTNo. 57199999_ «2) 15.11.1982

(71) RIZUMUJ4BOUSHIYA BtJWN-SEIZOU K.K.

(72) YOSHIYl^GGASAaLAJ ^\ \
(51) Int. CI 3 . F16D25/08

PURPOSE: To eliminate loss in liquid quantity when stepping on a clutch pedal anTTim-
prove the response of an actuating cylinder to the operation of said clutch pedal by
installing the piston of a vibration isolating device in series in a hydraulic route con-
necting a master cylinder to said actuating cylinder.

CONSTITUTION: A vibration isolating spring 17 is installed in a liquid chamber A on
the master-cylinder 2 side, partitioned by a piston 18, of a cylinder 16, and several
passages 20 are provided that connect the chamber A to a liquid chamber B on the
actuatingpiston 4 side; A valve mechanism consists, of a valve piston 22 which is
slidably installed in the center of the , piston 18 and^ which has a large diametral part
22a on the liquid chamber B side, and a~spring 2?rA"notched orifice 26 is provided on
the edge of the opening of one of the passages 20 on the liquid chamber B side, per-
manently providing a narrow passage between the liquid chambers A, B. When stepping
on a clutch pedal 1, liquid pressure provided in the master cylinder 2 is applied to the
liquid chamber A of a vibration isolating device 15 and, although the piston 18 which
is brought in contact with a stopper 19 does not move, the pressing force of the valve
piston 22 opens passages 20, thereby disconnecting a clutch 13 by means of the move-
ment of the actuating piston 4 due to hydraulic pressure.

©Int. CI. 3
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